A new study published online in Ophthalmology finds that certain changes in retinal blood vessels can be an early warning that a person is at increased risk for glaucoma, an eye disease that slowly robs people of their peripheral vision.

Most of us expect—and accept—the slow deterioration of our eyesight as an inevitable part of aging. But is it? A wealth of research indicates that protecting our baby blues (or browns or greens) could be as simple as eating the right foods or choosing targeted supplements.